using System;
    using System.Linq;
    class Program {
        static void Main(string[] args) {
            string read = Console.ReadLine().Trim();
            int[] ins = read.Split(' ').Select(x => int.Parse(x)).ToArray();
            int ans = (int)Math.Ceiling(Math.Abs(ins[0]) + Math.Abs(ins[1]) + Math.Sqrt(2) * ins[2]);
            Console.WriteLine(ans);
        }
    }